protoc-c.sh: Build in suffixed-subdirs

Fixes race in parallel build.

1 files changed, 7 insertions, 5 deletions

diff --git a/src/protoc-c.sh b/src/protoc-c.sh
index 163ff7d..4147799 100755
--- a/src/protoc-c.sh
+++ b/src/protoc-c.sh
@@ -2,10 +2,12 @@
 
 PROTOC_C=${PROTOC_C:-protoc-c}
 
-mkdir -p .protoc-c_build/
-cp $1 .protoc-c_build/
-cd .protoc-c_build/
+build_dir=".protoc-c_build_$(basename $2)/"
+
+mkdir -p "${build_dir}"
+cp $1 "${build_dir}"
+cd "${build_dir}"
 eval $PROTOC_C --c_out=. $(basename $1)
 cd ..
-mv .protoc-c_build/$(basename $2) $2
-rm -rf .protoc-c_build/
+mv "${build_dir}/$(basename $2)" $2
+rm -rf "${build_dir}"